Roland GO:MIXER PRO-X Audio Mixer for Smartphones

GO:MIXER PRO-X puts a real input list in front of a phone camera. Eleven input channels cover a combo XLR / 1/4-inch microphone jack, a 1/4-inch guitar or bass input, stereo mini instrument jacks, and two stereo line inputs, so a singer, a keyboard, a backing track, and a guitar can all reach the same video without a laptop. The XLR carries 48 V phantom at 6 mA, which means a condenser microphone works here and not only a dynamic.

The mixer connects to the phone over USB Micro-B, and Lightning, USB-C, and TRRS cables are in the box, so the connection matches whatever handset is in the rig. Three output channels feed the phone plus a stereo mini headphone or headset jack for monitoring while you record. Power comes off USB bus power when a host supplies it, or four AAA alkaline cells for roughly four hours when it does not. The unit is 104 x 155 x 41 mm and weighs 215 g without batteries.